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Appendix H - Detailed Description of Alternative 6: DoEI[tL-2oo1-11 Close in Place - Collapsed Structure 1tev.18 Draft II Redline/5trikeout 1 2 11.13.1.2 221-U Facility Modifications. Limited modifications to the 221-U Facility are 3 necessary to accomplish equipment removal and decontamination operations. Facility modifications 4 primarily involve disconnecting and blanking utility and electrical lines where they are no longer 5 required and installing temporary utilities that would be required to support planned operations. 6 The change room at the northeast end of the operating gallery would be renovated and 7 established as the main access and egress point for canyon operations. Water and drain lines for 8 the change room facility could tied into the active systems in the 271-U Office Building. 9 10 Additional 480-volt electrical service requirements would be installed, as necessary, to support 11 portable ventilation requirements and selected decontamination equipment, such as air 12 compressors for pneumatic tools and temporary greenhouse structures. In addition, 480-volt 13 ^ electrical service would be installed to support w erte ,.-Messi..o and 14 decontamination/disassembly operations. 15 16 H.13.13 Add New Air Handler. Installation of a new air-handling unit on the roof of 221-U 17 is a major modification that would oeeurmav or may not be rrnuired based on further analvsis of 18 tasks and seauencine of events that will be done during design . If needed. .:Ahe unit would be 19 located on the northeast end of the building and require penetrations through the roof for air duct 20 connections. r121 22 H.1.3.1.4 Grout Cell Drain Header and Vent Tunnel. The cell drain header would be filled 23 with cement grout during the building preparation phase once the new air handler is installed and 24 operational. Grouting would fill the 0.6-m (24-in.)-diameter void space and encapsulate any 25 contamination present in the pipe. After the connecting pipes to cell 10 are sealed, grout would 26 be pumped in from both ends of the cell drain header. Because the cell drain header flows 27 downward from the building ends toward cell 10, a liquid-consistency grout would flow through 28 the header and require very little pumping pressure. Drainage openings in each process cell 29 would act as air vents, and the pressure would be regulated so that the grout would be visible in 30 the process cell drains, but would not rise in the cells. After this operation, any liquid within the 31 canyon would not automatically flow to cell 10. 32 33 *Vestei.e¢acy equipment placement is not planned for the ventilation tunnel due to limited 34 accessibility of this area. Therefore, the ventilation tunnel would be grouted to eliminate voids 35 in the building structure. Holcs would be angle drilled through to canyon's exterior wall to allow 36 access to the ventilation tunnel for gt+outing. Free-flowing grout would be pumped through these 37 holes to fill the ventilation tunnel. The grouting would be completed in lifts to allow time for 38 heat dissipation during grout curing. The tunnel is planned to be filled with grout to the 39 maximum extent possible. It is estimated that the ventilation tunnel would require approximately 40 2,300 m3 (3,000 yd3) of grout. During final design, the decision to fill the tunnel should be 41 revisited. Preliminary structural calculations (Smyth 2001) show that the exteriorwall of the 42 tunnel may have sufficient strength to withstand later external pressures from fili heights 43 associated with burying the canyon building and, therefore, not require grouting. 44 Final Feasibility Study/or she Canyon Disposition Initiative (221•tJ Facility) J une 1oo^ H-9
Appendix H - Detailed Description of Alternative 6: DOFJItI.-2001-11 Close in Place - Collapsed Structu're itev..Ita DraU Rcd1ins1S1rikssxn 1 Facility modification would also involve removing and disposing of interfering structures, 2 equipment, and material. During this phase of the work scope, equipment and material removal 3 would be limited to "clean" areas of the 271-U Office Building, the 221-U Facility galleries, and 4 associated storage spaces. This activity would include the removal of the following: .5 6 • Installed and fixed equipment 7 • All unattached equipment and components 8 • Abandoned supplies 9 • Materials 10 11 • Debris. 12 13 These items would be sorted for reuse, recycle, or disposal. 14 H.1.3.2 Removal of Contaminated Equipment in 221-LJ it is estimated that there isgrc 15 16 17 18 19 (^-120 21 22 23 approximately 5,400 m3 (7,000 yd) of contaminated equipment and components (gross loose volume before size reduction currently 6toFed-on the canyon deck and in the process cells. For Alternative 6, those process cells with legacy equipment having dose rates >100 mrcm/hr would be opened only to place size-reduced legacy equipment from the operating deck and prour into them. All of the equipment would be reduced in size and volume and then disposed into the process cells meeting the dose rate criteria (except for cel13, which would be left unfilled for later equipment or-waste-placement). Size and volume reduction would be necessary so that all of the contaminated equipment would fit into the process cells. Minimizing the amount of size and volume reduction to just the amount of effort required to allow the contaminated equipment 24 25 to fit into the process cells would be desirable because it would limit worker exposure. 26 Ia t he-preeess-eelis-enFy 27 nd+kietding 28 ,' 29 30 31 32 33 34 35 36 37 38 0 0 39 40 Size and volume reduction would require a disposition plan for each equipment item. If breaking or cutting activities are necessary for disposing of the equipment, the 221-U Canyon Building 41 would be the best location to do these activities because it is a closed facility for controlling 42 contamination spread. The most significant contribution to worker exposure under Alternative 6 " 43 1 would be the size reduction of the contaminated legacy equipment that is currently •tered-on the 44 operating deck. Estimated worker dose for thcse activities alone is nearly 36 person-rem (BHI Final Feasibility Stady jor the Canyon Disposition lnhiative (221-U Facility) Iunc ?OOl H-10
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AR TARGET SHEET The following docum
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(^N r^ r Proposed Plan for the Cany
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i^ f 1 2 3 S 6 7 8 9 11 12 13 14 15
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(^N (0-^, (^N 1 2 3 r• • .`•
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^ (^N t^ the steHitFths+amedielaeti
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o"N DOF/RIr2001-29 Draft D Redline/
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(^N i0,"% / ' DOF/RL-2001-29 Draft
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I f^ ^ DOE!RL-2001-29 Ikaft D Redli
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! ' t^ Project Prepare the existing
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f ' ^ rN 100 I Noise, Visual, and A
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^ POINTS OF CONTA CP ^ U.S. Drnartm
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f^ n DOF/RL-2001-29 Draft D Redlinc
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noFIRL-2001-11 Rev. p 1 1)raft P ^
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^ ^ 1 2 DOFJRL-2001-11 Rev.A 1 Dra(
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. . .,.. Appendix C - Risk Modeling
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t^ Appendix C - Risk Modeling of an
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(_^% ^ ^ 11 Appendix C - Risk Model
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(0"% t^ DOFJRL-2001-1 l Rev. N 1 Dr
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1 ' ^ ^ DOEJRL-2001-1 t Rev.H1 nraf
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Appendix D- Slope Stability Analysi
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Appendix D - Slope Stability Analys
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(^N Appendix D- Slope Stability Ana
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• Appendix D-Slope Stability Anal
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^• r^, r^ 2 3 4 5 6 7 Appendix D-
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^ Appendix D-- Slope Stability Anal
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^ (00h^' ^ 2 DOFIRI^2001-I I Rev. J
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t^` ^ ^ 1 2 DOFJRL-2001-11 Rev. JDr
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Appendix E - Detailed Description o
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Appendix E- Detaiied Description of
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t^' Appendix E -Detailed Descriptio
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f,^N Appendix E - Detailed Descript
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(0^s 1,^N Appendix E - Detailed Des
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i^ r^'. ^ 1 2 DOFJRL-2001-11 Rev. 8
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^ ^ t^ 2 DOEIRL-2001-11 Rev. H Ihaf
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Appendix F - Detailed Description o
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Appendix F -Detailed Description of
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Appendix T- Detailed Description of
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Appendix F -Detailed Description of
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(O^N Appendix F - Detailed Descript
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Appendix E- Detailed Description of
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..^•. , Appendix F- Detailed Desc
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(^, Appendix F - Detailed Descripti
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(^N f ` Appendix F - Detailed Descr
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Appendix F-Detailerl Description of
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^`} Appendix F - Detailed Descripti
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Page 167 and 168: t^N (M"N Final Feasibifity Stady ja
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